Disc-drive head positioning systems

Details Disc-drive head positioning systems Disc-drive head positioning systems

1980-07-21

1983-04-12

Gruber, Felix D.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

364183, 364559, 364734, G11B 310, G11B 558, G05B 1502

Patent

active

043800335

ABSTRACT:
A servo system uses a position demand signal to drive a servo to position a transducer head over a specific track on a disc. The position demand signal is referenced to a tribit servo track on the disc. A tribit servo track demodulator circuit, similar to that taught by Mueller in U.S. Pat. No. 3,691,543, is used to compute a correction signal to be applied to the position demand signals used in the servo system. In the demodulator circuit (similar to the Mueller reference), first and second position indicating signals from the tribit servo track are processed on two parallel detection paths to compute an error signal. The invention improves the process by computing a first correction position demand signal from the error signal to position the transducer head over a null point proximate to the tribit servo track, and then switching the demodulator paths so the two position indicating signals are processed on the reverse demodulator paths to compute a second correction position demand signal to again position the transducer head over a second point where the transducer finds a null point proximate to the tribit servo track. The mean value of the first and second correction position demand signals is then computed and used in the servo system as a correction signal to be applied to position demand signals for movement of the head to other tracks on the disc. The mean value compensates for offset errors in the detection paths in establishing the tribit servo track location as a reference location.

REFERENCES:
patent: 3691543 (1972-09-01), Mueller
patent: 4074328 (1978-02-01), Hardwick
patent: 4085427 (1978-04-01), Dunn
patent: 4149199 (1979-04-01), Chick et al.
patent: 4188646 (1980-02-01), Sordello et al.

Affiliated with

Also associated with

Rating

Disc-drive head positioning systems does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Disc-drive head positioning systems, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Disc-drive head positioning systems will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-940624